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Dustin Johnson with the FedEx Cup trophy after the final round of the Tour Championship golf tournament at East Lake Golf Club. Image Credit: Reuters

Washington: World number one Dustin Johnson capped a two-under-par 68 with a birdie at the last to seal a three-stroke victory in the US PGA Tour Championship and earn the $15 million (Dh55 million) FedEx Cup playoff title.

Johnson finished with a 21-under-par total at East Lake Golf Club in Atlanta - three shots clear of Americans Xander Schauffele and Justin Thomas.